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Finding the Fourth Proportional to 211.35, 291.66 and 122.87

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Solution

The fourth proportional to 211.35, 291.66 and 122.87 is: 169.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.35 : 291.66 = 122.87 : x
  2. Step 2: Convert to fraction form
    211.35/291.66 = 122.87/x
  3. Step 3: Cross multiply
    211.35x = 291.66 × 122.87
  4. Step 4: Simplify right side
    211.35x = 35,834.81
  5. Step 5: Solve for x
    x = 35,834.81/211.35
  6. Step 6: Final answer
    x = 169.55

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.